DNA evidence left behind on gloves found about two miles from Nancy Guthrie‘s Tucson, Ariz., home did not yield any matches when law enforcement ran their profile through the national DNA database, the Pima County Sheriff’s Department said on Tues., Feb. 17.

On Tues., Feb. 10, authorities released surveillance photos and video footage of a masked man carrying a gun and wearing gloves on Nancy’s front porch in the early morning hours of Feb. 1, when authorities believe Nancy, 84, was abducted.

Days later, authorities found gloves on the side of the road about two miles from Nancy’s house that appeared to match the gloves worn by the assailant.

Investigators ran the DNA profile of the unknown male through the Combined DNA Index System (CODIS), the FBI’s national DNA database system.

“DNA evidence from gloves found approximately 2 miles from Nancy Guthrie’s residence was submitted to CODIS & produced no matches,” the PCSD wrote in an update on X.

“There is additional DNA evidence that was found at the residence that is also being analyzed,” the PCSD said.

As the investigation into the abduction of Today show co-host Savannah Guthrie‘s mother enters its third week, authorities are still trying to find the mother of three — and whoever took her.

Shortly after Nancy vanished, the potential kidnapper or kidnappers sent alleged ransom notes tied to Nancy’s disappearance to several media outlets.

After the release of images and video of the suspect, the FBI Phoenix office described him as “a male, approximately 5’9” – 5’10” tall, with an average build. In the video, he is wearing a black, 25-liter ‘Ozark Trail Hiker Pack’ backpack” that may have been purchased at Walmart.

The identification of the backpack has been one of the most promising leads authorities have gotten so far, said Pima County Sheriff Chris Nanos.

Authorities later disclosed that Guthrie’s doorbell camera was disconnected at 1:47 a.m., and a person was detected on the camera at 2:12 a.m. Sixteen minutes later, at 2:28 a.m., Guthrie’s pacemaker was disconnected from the pacemaker app on her cellphone, authorities said.

As the search for Nancy progresses into its third week, investigators are using a so-called “signal sniffer” to try to detect Bluetooth transmissions from Nancy’s pacemaker, law enforcement sources told CBS News.

Another lead came on Friday, Feb. 13, when the Pima County Sheriff’s Department (PSCD) said in a statement that “DNA other than Nancy Guthrie’s and those in close contact to her has been collected from the property.”

“Investigators are working to identify who it belongs to. We are not disclosing where that DNA was located.”

Since her mother has gone missing, Savannah, 54, has posted multiple videos on Instagram pleading for her mother’s safe return. In a clip shared on Sunday, Feb. 15, the journalist said, “It’s been two weeks since our mom was taken. And I just wanted to come on and say that we still have hope. And we still believe.”

Want to keep up with the latest crime coverage? Sign up for  PEOPLE‘s free True Crime newsletter for breaking crime news, ongoing trial coverage and details of intriguing unsolved cases.

A $100,000 reward has been offered for any information leading to Nancy’s recovery or an arrest in the case.

Anyone with information about Nancy Guthrie’s disappearance is asked to please contact 1-800-CALL-FBI (1-800-225-5324) or the Pima County Sheriff’s Department at 520-351-4900.